Question # 1

in the process of production of soap the soap can be salted out by adding

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Concentrated sulphuric acid

Concentrated potassium hydroxide solution

Concentrated sodium chloride solution

None of above

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

Different arrangement of groups in space which can be converted into one another by rotation around a single bond are caled.

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Conformations

Metameres

Enatiomers

All of the above

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

Yellow green flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

Which of the following statements regarding phenols is not correct.

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Phenol ls are stronger acids than water and alcohols.

Phenol are weaker acids than carboxylic acids

Phenol are solubel in both aqueous NaOH and aqueous sodium hydrogen carbonate

Phenoxides ions are more stable than the corresponding phenol

Which of the following statements is not a part of Bohr's theory of the hydrogen atom.

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An electron in an atom revolves aroung the nucleus only in circular paths.

An electron does not absorb energy in the stationary orbit

An electron does not emit energy in the stationary orbit

Energy is emitted or absorbed in a discrete amount from the stationary orbit

In which pair of species, the Lewis formulae contain same number of ion pairs and bond pairs but they are not isoelectronic.

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O2, N2

SO2, O3

PCl3 , BF3

SOCl2, COCl3

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Equivalent conductance is expressed in the units.

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S cm-1 eq -1

S cm eq-1

S cm2 eq-1

S cm2 eq

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Which of the following products is obtained when but 2-ene is treated with perchloric acid.

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CH3CHO only

CH3COOH only

CH3CHO and CH3COOH

CH3CH2COOH + HCOOH

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

Who proved that all the six hydrogen atoms in benzen are equivalent.

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Kekule

Ladenburg

Faraday

Wohler

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as.

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^ = ^m/2

^/2 = ^m

^ = ^m

^ = ^m/4

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

SO2 acts as

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Lewis base

Lewis acid

Botha A and B

None of above

Which of the following sulphide is yellow in colour.

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HgS

PbS

CdS

SnS

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

The state of hybridization of carbon in CO2 is

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sp2

sp

sp3

dsp2

Which of the following solution has pH= 11?

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1 X 10^-11 m NaOH

1 x 10^-11 m HCl

1 x 10^-3 M NaOH

1 X 10 ³ M NaOH

It has been observed that if one goes on adding KNO3 solution to a precipitate of AgCl the solubility of these precipitates goes on increasing with increasing concentration of K+ and NO3= ions which are not common to AgCl This is due to which effect.

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Divers ion effect

Uncommon ion effect

Activity effect

All above

Stainless steel contains

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Fe+Cr+Ni

Fe+Ni+Cu

Fe + Cr+ Cu

Cu + C + Ni

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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4000 A^o

5000 A^o

6000 A^o

10000 A^o

The property associated in thermometric tittration is

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Change in weight

Rate of change in weight

Heat evolved or absorbed

Change in temperature

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